In 1690, having performed the exercises of the university with uncommon reputation, he took his degree in philosophy; and, on that occasion, discussed the important and arduous subject of the distinct natures of the soul and body, with such-accuracy, perspicuity, and subtilty, that he entirely confuted all the sophistry of Epicurus, Hobbes, and Spinosa, and equally raised the characters of his piety and erudition.
Divinity was still his great employment, and the chief aim of all his studies. He read the scriptures in their original languages; and when difficulties occurred, consulted the interpretations of the most ancient fathers, whom he read in order of time, beginning with Clemens Romanus.
In the perusal of those early writers , he was struck with the profoundest veneration of the simplicity and purity of their doctrines, the holiness of their lives, and the sanctity of the discipline practised by them; but, as he descended to the lower ages, found the peace of Christianity broken by useless controversies, and its doctrines sophisticated by the subtilties of the schools: he found the holy writers interpreted according to the notions of philosophers, and the chimeras of metaphysicians adopted as articles of faith: he found difficulties raised by niceties, and fomented to bitterness and rancour: he saw the simplicity of the christian doctrine corrupted by the private fancies of particular parties, while each adhered to its own philosophy, and orthodoxy was confined to the sect in power.
Having now exhausted his fortune in the pursuit of his studies, he found the necessity of applying to some profession, that, without engrossing all his time, might enable him to support himself; and having obtained a very uncommon knowledge of the mathematicks, he read lectures in those sciences to a select number of young gentlemen in the university.
At length, his propension to the study of physick grew too violent to be resisted; and, though he still intended to make divinity the great employment of his life, he could not deny himself the satisfaction of spending some time upon the medical writers, for the perusal of which he was so well qualified by his acquaintance with the mathematicks and philosophy.
But this science corresponded so much with his natural genius, that he could not forbear making that his business, which he intended only as his diversion; and still growing more eager, as he advanced further, he at length determined wholly to master that profession, and to take his degree in physick, before he engaged in the duties of the ministry.
It is, I believe, a very just observation, that men’s ambition is, generally, proportioned to their capacity. Providence seldom sends any into the world with an inclination to attempt great things, who have not abilities, likewise, to perform them. To have formed the design of gaining a complete knowledge of medicine, by way of digression from theological studies, would have been little less than madness in most men, and would have only exposed them to ridicule and contempt. But Boerhaave was one of those mighty geniuses, to whom scarce any thing appears impossible, and who think nothing worthy of their efforts, but what appears insurmountable to common understandings.
He began this new course of study by a diligent perusal of Vesalius, Bartholine, and Fallopius; and, to acquaint himself more fully with the structure of bodies, was a constant attendant upon Nuck’s publick dissections in the theatre, and himself very accurately inspected the bodies of different animals.
Having furnished himself with this preparatory knowledge, he began to read the ancient physicians, in the order of time, pursuing his inquiries downwards, from Hippocrates through all the Greek and Latin writers.
Finding, as he tells us himself, that Hippocrates was the original source of all medical knowledge, and that all the later writers were little more than transcribers from him, he returned to him with more attention, and spent much time in making extracts from him, digesting his treatises into method, and fixing them in his memory.
He then descended to the moderns, among whom none engaged him longer, or improved him more, than Sydenham, to whose merit he has left this attestation, “that he frequently perused him, and always with greater eagerness.”
His insatiable curiosity after knowledge engaged him now in the practice of chymistry, which he prosecuted with all the ardour of a philosopher, whose industry was not to be wearied, and whose love of truth was too strong to suffer him to acquiesce in the reports of others.
Yet did he not suffer one branch of science to withdraw his attention from others: anatomy did not withhold him from chymistry, nor chymistry, enchanting as it is, from the study of botany, in which he was no less skilled than in other parts of physick. He was not only a careful examiner of all the plants in the garden of the university, but made excursions, for his further improvement, into the woods and fields, and left no place unvisited, where any increase of botanical knowledge could be reasonably hoped for.
In conjunction with all these inquiries, he still pursued his theological studies, and still, as we are informed by himself, “proposed, when he had made himself master of the whole art of physick, and obtained the honour of a degree in that science, to petition regularly for a license to preach, and to engage in the cure of souls;” and intended, in his theological exercise, to discuss this question, “why so many were formerly converted to Christianity by illiterate persons, and so few at present by men of learning.”
In pursuance of this plan he went to Hardewich, in order to take the degree of doctor in physick, which he obtained in July, 1693, having performed a publick disputation, “de utilitate explorandorum excrementorum in aegris, ut signorum.”
Then returning to Leyden, full of his pious design of undertaking the ministry, he found, to his surprise, unexpected obstacles thrown in his way, and an insinuation dispersed through the university, that made him suspected, not of any slight deviation from received opinions, not of any pertinacious adherence to his own notions in doubtful and disputable matters, but of no less than Spinosism, or, in plainer terms, of atheism itself.
How so injurious a report came to be raised, circulated, and credited, will be, doubtless, very eagerly inquired; we shall, therefore, give the relation, not only to satisfy the curiosity of mankind, but to show that no merit, however exalted, is exempt from being not only attacked, but wounded, by the most contemptible whispers. Those who cannot strike with force, can, however, poison their weapon, and, weak as they are, give mortal wounds, and bring a hero to the grave; so true is that observation, that many are able to do hurt, but few to do good.
This detestable calumny owed its rise to an incident, from which no consequence of importance could be possibly apprehended. As Boerhaave was sitting in a common boat, there arose a conversation among the passengers, upon the impious and pernicious doctrine of Spinosa, which, as they all agreed, tends to the utter overthrow of all religion. Boerhaave sat, and attended silently to this discourse for some time, till one of the company, willing to distinguish himself by his zeal, instead of confuting the positions of Spinosa by argument, began to give a loose to contumelious language, and virulent invectives, which Boerhaave was so little pleased with, that, at last, he could not forbear asking him, whether he had ever read the author he declaimed against.
The orator, not being able to make much answer, was checked in the midst of his invectives, but not without feeling a secret resentment against the person who had, at once, interrupted his harangue, and exposed his ignorance.
This was observed by a stranger who was in the boat with them; he inquired of his neighbour the name of the young man, whose question had put an end to the discourse, and having learned it, set it down in his pocket-book, as it appears, with a malicious design, for in a few days it was the common conversation at Leyden, that Boerhaave had revolted to Spinosa.
It was in vain that his advocates and friends pleaded his learned and unanswerable confutation of all atheistical opinions, and particularly of the system of Spinosa, in his discourse of the distinction between soul and body. Such calumnies are not easily suppressed, when they are once become general. They are kept alive and supported by the m
alice of bad, and, sometimes, by the zeal of good men, who, though they do not absolutely believe them, think it yet the securest method to keep not only guilty, but suspected men out of publick employments, upon this principle, that the safety of many is to be preferred before the advantage of few.
Boerhaave, finding this formidable opposition raised against his pretensions to ecclesiastical honours or preferments, and even against his design of assuming the character of a divine, thought it neither necessary nor prudent to struggle with the torrent of popular prejudice, as he was equally qualified for a profession, not, indeed, of equal dignity or importance, but which must, undoubtedly, claim the second place among those which are of the greatest benefit to mankind.
He, therefore, applied himself to his medical studies with new ardour and alacrity, reviewed all his former observations and inquiries, and was continually employed in making new acquisitions.
Having now qualified himself for the practice of physick, he began to visit patients, but without that encouragement which others, not equally deserving, have sometimes met with. His business was, at first, not great, and his circumstances by no means easy; but still, superiour to any discouragement, he continued his search after knowledge, and determined that prosperity, if ever he was to enjoy it, should be the consequence not of mean art, or disingenuous solicitations, but of real merit, and solid learning.
His steady adherence to his resolutions appears yet more plainly from this circumstance: he was, while he yet remained in this unpleasing situation, invited by one of the first favourites of king William the third, to settle at the Hague, upon very advantageous conditions; but declined the offer; for having no ambition but after knowledge, he was desirous of living at liberty, without any restraint upon his looks, his thoughts, or his tongue, and at the utmost distance from all contentions and state-parties. His time was wholly taken up in visiting the sick, studying, ntaking chymical experiments, searching into every part of medicine with the utmost diligence, teaching the mathematicks, and reading the scriptures, and those authors who profess to teach a certain method of loving God .
This was his method of living to the year 1701, when he was recommended, by Van Berg, to the university, as a proper person to succeed Drelincurtius in the professorship of physick, and elected, without any solicitations on his part, and almost without his consent, on the 18th of May.
On this occasion, having observed, with grief, that Hippocrates, whom he regarded not only as the father, but as the prince of physicians, was not sufficiently read or esteemed by young students, he pronounced an oration, “de commendando studio Hippocratico;” by which he restored that great author to his just and ancient reputation.
He now began to read publick lectures with great applause, and was prevailed upon, by his audience, to enlarge his original design, and instruct them in chymistry. This he undertook, not only to the great advantage of his pupils, but to the great improvement of the art itself, which had, hitherto, been treated only in a confused and irregular manner, and was little more than a history of particular experiments, not reduced to certain principles, nor connected one with another: this vast chaos he reduced to order, and made that clear and easy, which was before, to the last degree, difficult and obscure.
His reputation now began to bear some proportion to his merit, and extended itself to distant universities; so that, in 1703, the professorship of physick being vacant at Groningen, he was invited thither; but he refused to leave Leyden, and chose to continue his present course of life.
This invitation and refusal being related to the governours of the university of Leyden, they had so grateful a sense of his regard for them, that they immediately voted an honorary increase of his salary, and promised him the first professorship that should be vacant.
On this occasion he pronounced an oration upon the use of mechanicks in the science of physick, in which he endeavoured to recommend a rational and mathematical inquiry into the causes of diseases, and the structure of bodies; and to show the follies and weaknesses of the jargon introduced by Paracelsus, Helmont, and other chymical enthusiasts, who have obtruded upon the world the most airy dreams, and, instead of enlightening their readers with explications of nature, have darkened the plainest appearances, and bewildered mankind in errour and obscurity.
Boerhaave had now for nine years read physical lectures, but without the title or dignity of a professor, when, by the death of professor Hotten, the professorship of physick and botany fell to him of course.
On this occasion he asserted the simplicity and facility of the science of physick, in opposition to those that think obscurity contributes to the dignity of learning, and that to be admired it is necessary not to be understood.
His profession of botany made it part of his duty to superintend the physical garden, which improved so much by the immense number of new plants which he procured, that it was enlarged to twice its original extent.
In 1714, he was deservedly advanced to the highest dignities of the university, and, in the same year, made physician of St. Augustin’s hospital in Leyden, into which the students are admitted twice a week, to learn the practice of physick.
This was of equal advantage to the sick and to the students, for the success of his practice was the best demonstration of the soundness of his principles.
When he laid down his office of governour of the university, in 1715, he made an oration upon the subject of “attaining to certainty in natural philosophy;” in which he declares, in the strongest terms, in favour of experimental knowledge; and reflects, with just severity, upon those arrogant philosophers, who are too easily disgusted with the slow methods of obtaining true notions by frequent experiments; and who, possessed with too high an opinion of their own abilities, rather choose to consult their own imaginations, than inquire into nature, and are better pleased with the charming amusement of forming hypotheses, than the toilsome drudgery of making observations.
The emptiness and uncertainty of all those systems, whether venerable for their antiquity, or agreeable for their novelty, he has evidently shown; and not only declared, but proved, that we are entirely ignorant of the principles of things, and that all the knowledge we have, is of such qualities alone as are discoverable by experience, or such as may be deduced from them by mathematical demonstration.
This discourse, filled as it was with piety, and a true sense of the greatness of the supreme being, and the incomprehensibility of his works, gave such offence to a professor of Franeker, who professed the utmost esteem for Des Cartes, and considered his principles as the bulwark of orthodoxy, that he appeared in vindication of his darling author, and spoke of the injury done him with the utmost vehemence, declaring little less than that the cartesian system and the Christian must inevitably stand and fall together; and that to say that we were ignorant of the principles of things, was not only to enlist among the skepticks, but to sink into atheism itself.
So far can prejudice darken the understanding, as to make it consider precarious systems as the chief support of sacred and invariable truth.
This treatment of Boerhaave was so far resented by the governours of his university, that they procured from Franeker a recantation of the invective that had been thrown out against him: this was not only complied with, but offers were made him of more ample satisfaction; to which he returned an answer not less to his honour than the victory he gained, “that he should think himself sufficiently compensated, if his adversary received no further molestation on his account.”
So far was this weak and injudicious attack from shaking a reputation not casually raised by fashion or caprice, but founded upon solid merit, that the same year his correspondence was desired upon botany and natural philosophy by the academy of sciences at Paris, of which he was, upon the death of count Marsigli, in the year 1728, elected a member.
Nor were the French the only nation by which this great man was courted and distinguished; for, two years after, he was elected fellow of our Royal society.
It cannot be doubted but, thus caressed and honoured with the highest and most publick marks of esteem by other nations, he became more celebrated in the university; for Boerhaave was not one of those learned men, of whom the world has seen too many, that disgrace their studies by their vices, and, by unaccountable weaknesses, make themselves ridiculous at home, while their writings procure them the veneration of distant countries, where their learning is known, but not their follies.
Not that his countrymen can be charged with being insensible of his excellencies, till other nations taught them to admire him; for, in 1718, he was chosen to succeed Le Mort in the professorship of chymistry; on which occasion he pronounced an oration, “De chemia errores suos expurgante,” in which he treated that science with an elegance of style not often to be found in chymical writers, who seem generally to have affected, not only a barbarous, but unintelligible phrase, and to have, like the Pythagoreans of old, wrapt up their secrets in symbols and enigmatical expressions, either because they believed that mankind would reverence most what they least understood, or because they wrote not from benevolence, but vanity, and were desirous to be praised for their knowledge, though they could not prevail upon themselves to communicate it.
In 1722, his course, both of lectures and practice, was interrupted by the gout, which, as he relates it in his speech after his recovery, he brought upon himself, by an imprudent confidence in the strength of his own constitution, and by transgressing those rules which he had a thousand times inculcated to his pupils and acquaintance. Rising in the morning before day, he went immediately, hot and sweating, from his bed into the open air, and exposed himself to the cold dews.
The history of his illness can hardly be read without horrour: he was for five months confined to his bed, where he lay upon his back without daring to attempt the least motion, because any effort renewed his torments, which were so exquisite, that he was, at length, not only deprived of motion but of sense. Here art was at a stand; nothing could be attempted, because nothing-could be proposed with the least prospect of success. At length, having, in the sixth month of his illness, obtained some remission, he took simple medicines in large quantities, and, at length, wonderfully recovered.
Complete Works of Samuel Johnson Page 514
